In one method of measuring backlash, a bar is attached to the driven shaft and a dial indicator measures its movement. this method must be adjusted to account for the flexion or bending of the bar.
It is because When using the bar method to measure backlash, a bar is attached to the driven shaft and a dial indicator measures its movement.
However, the bar may flex or bend due to its own weight or external forces, leading to inaccurate measurements of the backlash.
Therefore, to obtain accurate results, the method must be adjusted to account for the flexure or bending of the bar. This can be done by placing the bar in a support at some distance from the indicator or by using a more rigid and less flexible bar.
It is important to account for the flexure of the bar to ensure accurate measurements and proper functioning of the system.
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suppose your planet at 1 meter from the basketball represents a distance of 4 x 107 km (-0.3 al) from the star. the next closest star to the sun is 4 x 1013 km away. how far away from the model star/planet would you have to be for the distances in the system to be to scale? express your answer in meters and kilometers.
Answer: The model star/planet would have to be 1,000 km away from the next closest star.
Explanation:
We need to find out the distance required for the distances in the system to be in scale.
Let's use the proportion to solve the problem:
1 m/4 × 10⁷ km = x/4 × 10¹³ km
Where x is the distance required for the distances in the system to be in scale.
Cross-multiply: 4 × 10¹³ km × 1 m = 4 × 10⁷ km × x
Simplify: 4 × 10¹³ m = 4 × 10⁷ x
Divide both sides by 4 × 10⁷ :1 × 10⁶ = x
Therefore, the distance required for the distances in the system to be in scale is 1 × 10⁶ m or 1,000 km.
So the model star/planet would have to be 1,000 km away from the next closest star.
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a jet pilot takes his aircraft in a vertical loop. if the jet is moving at a speed of 840 km/h at the lowest point of the loop, determine the minimum radius of the circle
The minimum radius of the circle made by the jet pilot in the vertical loop is 2773.3 meters.
To find the minimum radius of the circle made by the jet pilot in the vertical loop, we need to use the formula for centripetal force as follows:
F = m * v² / r
where
F is the centripetal force, m is the mass of the object, v is the speed of the object and r is the radius of the circle.The jet pilot is moving at a speed of 840 km/h which is equivalent to 840/3.6 = 233.3 m/s.
Let's assume the mass of the aircraft is 5000 kg.The centripetal force in this case is given by:
F = m * v² / rF = 5000 * (233.3)² / rF = 5000 * 54388.89 / rF = 271,944,450 / rAt the lowest point of the loop, the pilot experiences an apparent weight equal to twice the force due to gravity. This means that the net force experienced by the pilot is 2F = 2 * 271,944,450 / r. This net force is given by the difference between the centrifugal force and the gravitational force. Since the centrifugal force is equal to the centripetal force, we have:
F = m * g
where
g is the acceleration due to gravity.Since the apparent weight is twice the actual weight, we have:
2m * g = F2 * m * g = m * v² / r2 * 9.81 = 54388.89 / r2 * r = 54388.89 / 19.62r = 2773.3 m
Therefore, the minimum radius of the circle made by the jet pilot in the vertical loop is 2773.3 meters.
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magnetic poles are similar to electric charges in that they...
Magnetic poles are similar to electric charges in that they produce fields around them that can attract or repel other objects.
Similar to how electric charges create electric fields around them that can pull or push away other charges, magnetic poles also create magnetic fields that can pull or push away other poles. The distance between the poles and how they are oriented in relation to one another affect the magnetic force's strength. Similarly, the distance between the charges and their orientation in relation to one another affect the strength of the electric force between them. Magnetic poles and electric charges do, however, differ significantly in terms of their origins and how they interact with one another. Magnetic poles always exist in pairs (north and south), unlike electric charges, which can be positive or negative and exist in isolated particles.
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A 1200-turn coil of wire that is 2. 3 cm in diameter is in a magnetic field that drops from 0. 13 T to 0 T in 12 ms. The axis of the coil is parallel to the field. What is the emf of the coil? Express your answer using two significant figures
In a magnetic field that decreases from 0. 13 T to 0 T in 12 ms, a wire coil with 1200-turns and a 2. 3 cm diameter is placed. The coil's axis is perpendicular to the field. The coil's emf is 0.059 V.
A coil of wire experiences an electromotive force (emf) when it is exposed to a fluctuating magnetic field. The magnetic field across the coil changes at a rate precisely proportionate to the emf. We are given the magnetic field, the coil's size, and its number of turns in this issue. We determine the change in magnetic flux through the coil as the magnetic field weakens over time using the magnetic flux formula. Lastly, we determine the induced emf in the coil using the emf formula. The response, 0.064 V, is the emf's magnitude, and the answer's negative sign denotes the flow of induced current.
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Gas G1 G2 G3 G4 2am/mol2) L/mol) 0.0289 0.0388 0.0467 0.0310 2 5.22 1.05 2.31 4.05 Based on the given van der Waals constants for four hypothetical gases (G1, G2, G3, G4), arrange these hypothetical gases in order of decreasing strength of intermolecular forces. Assume that the gases have similar molar masses.
Rank from strongest to weakest intermolecular attraction. To rank items as equivalent, overlap them.
Gas 3, Gas 2, Gas 1, Gas 4
According to the strength of the intermolecular forces, the hypothetical gases can be ordered as follows: Gas 3 > Gas 2 > Gas 1 > Gas 4.
The strength of intermolecular forces in gases can be estimated by analyzing their van der Waals constants, which take into account the size and polarizability of the molecules. A higher value of the van der Waals constant indicates stronger intermolecular forces.
Based on the given van der Waals constants, we can rank the hypothetical gases in order of decreasing strength of intermolecular forces as follows:
Gas 3 > Gas 2 > Gas 1 > Gas 4
Gas 3 has the highest van der Waals constant (a = 2.31 L/mol), indicating the strongest intermolecular forces, while Gas 4 has the lowest van der Waals constant (a = 4.05 L/mol), indicating the weakest intermolecular forces. Gas 2 and Gas 1 have intermediate values of van der Waals constants, with Gas 2 having a higher value than Gas 1, indicating stronger intermolecular forces.
Therefore, the hypothetical gases can be ranked in order of decreasing strength of intermolecular forces as Gas 3 > Gas 2 > Gas 1 > Gas 4.
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A typical value for the dielectric constant of rubber is a minimum of 2. Give one reason why your experimental value was less than two!
What are the dependent and independent variables in thid experiment?
The independent variable in this experiment is the dielectric constant of rubber, and the dependent variable is the measured value. The typical value for the dielectric constant of rubber is a minimum of 2, but your experimental value could have been lower than two.
The dependent and independent variables in this experiment are not specified. Therefore, it is impossible to answer the question accurately. A typical value for the dielectric constant of rubber is a minimum of 2.
The dielectric constant is defined as the ratio of the electric flux density produced in a substance to that produced in a vacuum by the same electric field.
The dielectric constant is a measure of a substance's ability to store charge in an electric field. The dielectric constant of a substance indicates how easily it can be polarized in response to an applied electric field.
It varies with temperature, frequency, and pressure, among other factors.
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How do upper fixed point calibrate in a thermometer? Explain it,
Answer:
An upper fixed point calibration in a thermometer involves establishing a reference point at the highest temperature that the thermometer can measure accurately. This reference point is typically defined by the boiling point of a pure substance at a specific atmospheric pressure, such as water at standard atmospheric pressure (100°C or 212°F).
To calibrate the thermometer's upper fixed point, the thermometer is first placed in a container of boiling water and allowed to reach thermal equilibrium with the water. The thermometer's reading is then compared to the known boiling point of the substance at that pressure, and any differences are noted. If the thermometer reads higher or lower than the expected boiling point, the thermometer can be adjusted or calibrated accordingly to ensure that it provides accurate temperature readings.
It's important to note that the calibration of a thermometer's upper fixed point should be performed under controlled conditions, as variations in pressure or impurities in the substance being used to establish the reference point can affect the accuracy of the calibration. Additionally, regular recalibration may be necessary to ensure continued accuracy of the thermometer.
Explanation:
upslope fog hugging the mountain surface occurs when: question 12 options: a. air warms because of decreasing atmospheric pressure
b. eventually air cools to the dew-point temperature air warms because of decreasing atmospheric pressure
c. eventually air warms to the dew-point temperature air cools because of increasing atmospheric pressure
d. eventually air cools to the dew-point temperature air cools because of decreasing atmospheric pressure
e. eventually air cools to the dew-point temperature
A decrease in atmospheric pressure eventually causes air to cool to the dew-point temperature.
How does surface-hugging upslope fog on mountains occur?Fog on an upward slope forms adiabatically. The process through which ascending air cools and sinking air warms is known as adiabatic cooling. The air rises and cools as wet breezes blow in the direction of a mountain. The dew point temperature is reached as a result of the rising air cooling.
Upslope fog: what is it?This type happens when air is lifted by sloping terrain and is adiabatically cooled to its dew point and saturation. Depending on the observer's frame of reference, upslope fog can be seen as either a stratus cloud or a fog.
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A block of weight w = 25.0 N sits on a frictionless inclined plane, which makes an angle 8 = 29.0° with respect to the horizontal, as shown in the figure. (Figure 1) A force of magnitude F = 12.1 N, applied parallel to the incline, is just sufficient to pull the block up the plane at constant speed.
Part B: What is We, the work done on the block by the force of gravity was the block moves a distance L = 3.40 m up the incline?
Part C. What is Wf the work done on the block by the applied force F as the block moves a distance L = 3.40 mm up the incline? Express your answer in Joules
a) The net Work done is zero. b) The work done on the block by the applied force F as the block moves a distance L is -41.2 J. c) The work done on the block by the applied force F as the block moves a distance L is 41.2 J.
Given:
Weight of the block (w) = 25.0 N
Distance moved by the block (d) = 3.40 m
The angle of the inclined plane (θ) = 29.0°
a) we know that from the work-energy theorem,
W = change in kinetic energy
But since speed is constant which means no change in KE, hence the net Work done is zero.
b) W = -mgy
W = -25 × (3.10 × sin29°)
W = -41.2 J
Therefore, the work done on the block by the force of gravity is -41.2 J.
c) The work done on the block by the applied force F as the block moves a distance L = 3.10m up the incline is,
W = Fd
W = 12.1 × 3.1
W = 41.2 J
Therefore, the work done on the block by the applied force F as the block moves a distance L is 41.2 J.
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Car A (traveling north at 70 mph) and car B (traveling west at 50 mph) are heading toward the same intersection. Car A is 5 miles from the intersection while car B is 6 miles from the intersection. Find parametric equations that describe the motion of cars A and B.
A) Car A: x = 0, y = 70t-5; Car B: x = 6 - 50 t, y = 0
B) Car A: x = 0, y = 50t - 6; Car B: x = 70t - 5, y = 0
C) Car A: x = -70t + 5, y = 0; Car B: x = 6 - 50t, y = 0
D) Car A: x = 50t - 6, y = 0; Car B: x = 0, y = 50 - 70t
The parametric equations that describe the motion of cars A and B while Car A traveling north at 70 mph and car B is traveling west at 50 mph and they both are heading toward the same intersection :
Car A: x = -70t + 5, y = 0Car B: x = 6 - 50t, y = 0
So, Option C is the right answer.
According to the problem,Car A is moving northwards while car B is moving westwards with the speeds of 70 mph and 50 mph respectively. The cars are heading towards the same intersection.
Car A is 5 miles from the intersection and Car B is 6 miles from the intersection.
Using the equation of motion in two dimensions, the positions of cars A and B can be described in terms of their distances from the intersection and the time elapsed as:
x = distance traveled in x direction, y = distance traveled in y direction
Car A: Initial distance from intersection = 5 miles, Speed = 70 mph = (70/60)mph = (7/6)miles per minute. Time elapsed from start of the motion = t minute
Parametric equation of motion for Car A = (x, y) = (-70t+5,0)
Car B: Initial distance from intersection = 6 miles, Speed = 50 mph = (50/60)mph = (5/6)miles per minute. Time elapsed from start of the motion = t minute
Parametric equation of motion for Car B = (x, y) = (6-50t,0)
Therefore, the correct option is C) Car A: x = -70t + 5, y = 0; Car B: x = 6 - 50t, y = 0.
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Suppose you have a 8.4 cm diameter fire hose with a 2.2 cm diameter nozzle.a. Calculate the pressure drop due to the Bernoulli effect as water enters the nozzle from the hose at the rate of 40.0 L/s. Take 1.00 × 103 kg/m3 for the density of the water.b. To what maximum height, in meters, above the nozzle can this water rise? (The actual height will be significantly smaller due to air resistance.)
The pressure drop due to the Bernoulli effect is 33.14 Pa. and
A). P1 + (1/2)ρv1² = P2 + (1/2)ρv2²
P1 + (1/2)ρv1² = P2 + (1/2)ρ(7.28v1)²
P1 - P2 = (1/2)ρ(v2² - v1²)
P1 - P2 = (1/2)(1000 kg/m³)(7.28² - 1) v1²
P1 - P2 = 20,710 v1²
Substituting the values, we get:
P1 - P2 = 20,710 (0.040)²
P1 - P2 = 33.14 Pa
B). (1/2)mv2² = mgh
The mass of water that enters the nozzle per second is:
ρAv2 = (1000 kg/m³)(3.8 cm²)(7.28v1)
ρAv2 = 26.86v1
Substituting this into the conservation of energy equation, we get:
(1/2)(26.86v1)v2^2 = (26.86v1)gh
v2^2 = 2gh
Substituting the value of v2 from part (a), we get:
(7.28v1)² = 2gh
Solving for h, we get:
h = ((7.28v1)²)/(2g)
h = ((7.28(40.0/55.4))²)/(2(9.81))
h = 7.05 m
Pressure is a fundamental physical quantity that measures the force exerted per unit area. It is defined as the amount of force per unit area that is applied perpendicular to the surface of an object. Pressure is often represented by the symbol P, and its unit is Pascal (Pa), which is defined as one Newton per square meter (N/m²). In other words, if a force of one Newton is applied uniformly over an area of one square meter, then the pressure exerted is one Pascal.
Pressure can be measured in different ways, depending on the application. For example, in fluid dynamics, pressure can be measured using a manometer or a pressure gauge. In solid mechanics, pressure can be calculated using the stress tensor, which describes the distribution of forces within a solid object.
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two spheres are cut from a certain uniform rock. one has radius 4.45 cm. the mass of the other is six times greater. find its radius.
The radius of the second sphere is approximately 11.95 cm. This can be calculated by the volume of sphere.
What is the radius?The mass is proportional to the volume of the spheres. The volume of a sphere is given by the formula:
V = (4/3)πr³
Let the radius of the first sphere be r₁ (4.45 cm) and the radius of the second sphere be r₂. Given that the mass of the second sphere is six times greater than the first sphere, we can write:
M2 = 6 × M1
Since mass is proportional to volume, we can also say: V2 = 6 × V1
Now, substitute the volume formula for both spheres: (4/3)πr₂³ = 6×(4/3)πr₁³
Divide both sides by (4/3)π to simplify: r₂³ = 6 × r₁³
Plug in the value of r₁ (4.45 cm): r₂³ = 6 × (4.45)³
Now, calculate the value of r₂³: r₂³ ≈ 1683.107
Take the cube root of both sides to find r₂: r₂ ≈ (1683.107)^(1/3) r₂ ≈ 11.95 cm.
So, the radius of the second sphere is approximately 11.95 cm.
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When current flows through a conductor, it develops a magnetic field of concentric circles expanding ? and outward from the conductor. a. circularly b. parallel c. perpendicular d. wavy
When a current travels through a conductor in a circular motion, a magnetic field with growing concentric circles is created.
What happens when current flows through a conductor?Electromagnetism is established when an electrical current flows through a simple conductor, such as a length of wire or cable.
What magnetic field is created when current travels through a conductor?As magnetic fields produced by moving charges are proportional to the current, a conductor carrying current creates a magnetic field around it. Generally speaking, the sub-atomic particles in the conductor, such as the moving electrons in the atomic orbitals, are responsible for this magnetic field.
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What technological improvement in the 1920s allowed more goods to be produced at one time?
Automobile
Assembly line
Telephone
Motion picture
Answer: Telephone
Explanation:
The technological improvement that allowed more goods to be produced at one time in the 1920s was the development and widespread use of assembly line production. This was pioneered by companies such as Ford Motor Company, which introduced the assembly line to its automobile factories. The assembly line method allowed for the mass production of standardized products using specialized machines and workers performing specific tasks. By breaking down the manufacturing process into smaller, simpler tasks, and optimizing the movement of workers and materials, the assembly line significantly increased production efficiency and output. This led to the growth of mass production industries, increased affordability of goods, and a significant shift in the nature of work in the 20th century.
An automatic saw has several forces acting on it. In a Cartesian system, a position-dependent force applied to the saw is =-kxy2j, with k = 2.50 N m³. Let's consider the displacement of the saw from the origin to point C (4.0 m, 4.0 m). Calculate the work done on the saw by if the displacement is along the straight-line y = x that connects these two points.
The work done on the saw by the force if the displacement is along the straight-line y = x that connects these two points is -640.0 J.
How to calculate work done?To calculate the work done on the saw by the force as it moves along the straight-line y = x that connects the two points, we need to first find the displacement vector and then use it to calculate the work done.
The displacement vector from the origin to point C is given by:
r = (4.0 m) i + (4.0 m) j
The force acting on the saw is given by:
F = -kxy² j = -2.50 (N m³) (x) (y²) j
Since it is moving along the straight-line y = x, we can substitute x = y into the expression for F:
F = -2.50 (N m³) (x) (y²) j = -2.50 (N m³) (y³) j
Substituting x = y = 4.0 m:
F = -2.50 (N m³) (4.0 m)³ j = -160.0 j N
The work done by the force is given by the dot product of the force and displacement vectors:
W = F · r = (-160.0 N j) · (4.0 m i + 4.0 m j)
W = (-160.0 N) (4.0 m cos(45°))
W = -640.0 J
Therefore, the work done on the saw by the force as it moves along the straight-line y = x that connects the two points is -640.0 J.
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Homework, pls help me
The region of the periodic table that the unknown element would likely be found is metals (option A).
What are metals?Metals are a number of chemical elements in the periodic table that form a metallic bond with other metal atoms.
Metals are generally shiny, somewhat malleable and hard, often a conductor of heat and electricity.
According to this question, an unknown element has good conductivity and is a solid at room temperature. It possesses two valence electrons.
Elements with two valence electrons can be found in group two of the periodic table, which is a metallic element.
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Discuss the changes in potential energy, kinetic energy, and total energy for a skateboarder going up and down on a half-pipe (U-shaped) ramp. Specifically address the energies when the skater is at the highest point (A), half-way down the ramp (B), and at the lowest point (C)
The real truth is that there's always some friction, friction robs kinetic energy whenever he's moving, so eventually he stops going up and down. Then he has to put some muscle energy into it to go some more.
Friction is a force that opposes the relative motion or attempts at motion between two surfaces in contact. It is the reason why we feel resistance when we try to slide an object across a surface or why it takes effort to walk or run. Friction can occur between solids, liquids, and gases, although it is most commonly observed in solids.
The force of friction arises from the interactions between the microscopic irregularities on the surfaces in contact. As two surfaces slide past each other, the irregularities interlock and resist further motion. The greater the force pressing the surfaces together, the greater the friction force. Friction is a fundamental force of nature that has both positive and negative effects.
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a 3 3-inch candle burns down in 12 hours. if b represents how much of the candle, in inches, has burned away at any time given in hours, t, write a proportional equation for b in terms of t that matches the context.
The proportional equation that matches the context of a 33-inch candle burning down in 12 hours is b = 2.75t.
A candle that is 33 inches long is called a 33-inch candle. Candles are a popular decorative item that is commonly used for lighting, as decoration for weddings, and parties, or to create an aromatic atmosphere. B represents the length of the candle that has burned away at any time given in hours, t.
To find the proportional equation for b in terms of t that matches the context of a 33-inch candle burning down in 12 hours, the following steps should be followed:
Identify the given informationThe length of the candle (l) = 33 inchesThe time taken for the candle to burn down (t) = 12 hours
Determine the rate of burning The rate of burning of the candle is given by l/t. Therefore, the rate of burning = 33/12 = 2.75 inches per hour.
The proportional equation for b in terms of t is given by b = rt where r is the rate of burning. Therefore, b = 2.75t.
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when you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to ......
When you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to move outwards. This phenomenon is known as the motion aftereffect (MAE).
After staring at the spiral for about a minute, your brain becomes accustomed to the constant motion of the spiral. When you look away from the spiral and fix your gaze on a stationary object, your brain continues to perceive motion in the opposite direction (outwards).
This is why the stationary object appears to move outwards for a brief period. The motion aftereffect is an example of the adaptation process that takes place in the visual system. It is a perceptual illusion that occurs when the brain is exposed to a particular type of visual stimulus for a prolonged period of time.
Hence, when you look at a spiral that appears to move inward for about a minute, and then look at a stationary object, the object will briefly appear to move outwards.
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two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. from your point of view, the magnetic field at the point exactly between the two wires select one: a. points down. b. points toward you. c. is zero. d. points away from you.
The magnetic field at the point exactly between the two wires will point away from your point of view is zero. The correct option is C.
What is the magnetic field?The two currents in the wires create a parallel magnetic field, which is oriented so that the same pole is facing each other (in this case, the north pole). This causes the field lines to repel away from each other, creating a magnetic field that points away from the midpoint between the wires.
The magnetic field at the point exactly between the two wires is zero. Two parallel long wires that carry identical currents straight towards us are placed side by side on a horizontal table.
As a result, the net magnetic field is zero.
Therefore, the correct option is C.
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A cylindrical pulley with a mass of 7.7 kg, radius of 0.532 m and moment of inertia 1/2 M r^2 is used to lower a bucket with a mass of 2.4 kg into a well. The bucket starts from rest and falls for 4.5 s. a) What is the linear acceleration of the falling bucket? The acceleration of gravity is 9.8 m/s^2. Answer in units of m/s^2. b) How far does it drop? Answer in units of m. c) Find the angular acceleration of the cylinder. Answer in units of rad/s22.
The linear acceleration of the falling bucket can be calculated using the formula.
a = g - (T/M)
where g is the acceleration of gravity (9.8 m/s²), T is the torque exerted by the pulley (T = Iα, where I is the moment of inertia, and α is the angular acceleration), and M is the mass of the bucket. We can calculate the torque of the pulley by substituting the given values:
T = (1/2 M r²) * (α)
T = (1/2) * (7.7 kg) * (0.532 m)² * (α)
T = 2.01 (kg m²) * (α).
Therefore,
a = 9.8 m/s² - (2.01 (kg m^2) * (α) /2.4 kg)
a = 9.58 m/s²
The distance traveled by the bucket can be calculated using the formula
d = (1/2) * a * t²
where a is the acceleration of the bucket (9.58 m/s²) and t is the time it takes to fall (4.5 s).
Therefore,
d = (1/2) * (9.58 m/s²) * (4.5 s)²
d = 98.2 m
The angular acceleration of the cylinder can be calculated using the formula
α = T/I
where T is the torque exerted by the pulley (2.01 (kg m²) * (α)) and I is the moment of inertia (1/2 M r²).
Therefore,
α = 2.01 (kg m²) * (α) / (1/2) * (7.7 kg) * (0.532 m)²
α = 10.3 rad/s²
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explain why hydrogen is not a dominant component of the atmospheres of the terrestrial planets, even though it is the most common element in the universe and in the solar system.
Hydrogen is not a dominant component of the atmospheres of the terrestrial planets, even though it is the most common element in the universe and solar system because it is a volatile and low molecular weight element.
What is Hydrogen?Hydrogen element is not a dominant component of the atmospheres of the terrestrial planets, even though it is one of the most common element in the universe and in the solar system as well because the planets were formed through the accretion.
Accretion is the process by which the small particles combine into progressively larger bodies which become planets. As a result of this, the process left behind the lighter gas elements such as hydrogen and helium. The gas molecules of hydrogen atom are lighter than the rest of the chemical elements, therefore the gravity of the terrestrial planets is not sufficient to hold them. As a result, hydrogen escapes from the planet's atmosphere, leaving behind the heavier elements like carbon dioxide, nitrogen, and oxygen in their atmospheres.
Therefore, although hydrogen is the most common element in the universe and in the solar system, it is not a major constituent of the terrestrial planets.
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the end result of a theory that is not verified is
Unproven theories ultimately cannot be regarded as scientific facts or principles and are not generally recognised by the scientific community.
A well-supported explanation of a natural occurrence in science that has passed rigorous examination and is backed by empirical data is referred to as a theory. A hypothesis, however, cannot be regarded as a scientific fact or principle if it is not backed up by empirical data or if it has not undergone extensive testing and verification. The scientific community frequently rejects unproven notions with scant empirical backing and may even label them as pseudoscientific or non-scientific. This is so that scientific theories and findings may be evaluated and verified frequently. Science does this by using evidence-based reasoning and critical thinking. Unproven theories are therefore eventually not regarded as being a part of the corpus of scientific knowledge.
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Q9: A bungee jumper falls with a total of 7.8kJ of kinetic energy. If the bungee jumper's total mass is 50kg, at what speed do they fall?
The bungee jumper falls at a speed of approximately 17.67 meters per second.
What is the bungee jumper fall speed?Kinetic energy is simply a form of energy a particle or object possesses due to its motion.
It is expressed as;
K = (1/2)mv²
Where m is mass of the object and v is its velocity.
We know that the kinetic energy of the bungee jumper is 7.8 kJ and their mass is 50 kg.
Substituting these values into the equation gives:
K = (1/2)mv²
7.8 kJ = (1/2) × 50 kg × v²
Convert from kiloJoule to Joule
7.8 kJ = (7.8 × 1000 ) = 7800J
Simplifying:
7800J = (1/2) × 50 kg × v²
7800 kgm²/s² = (1/2) × 50 kg × v²
7800 kgm²/s² = 25 kg × v²
v² = 7800 kgm²/s² ÷ 25kg
v² = 312 m²/s²
Taking the square root of both sides:
v = √( 312 m²/s² )
v = 17.67 m/s
Therefore, the fall speed is 17.67 m/s.
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19. Which statement correctly describes a short circuit?
O A. Having a part with very low resistance keeps the circuit cooler, preventing
damage caused by overheating.
O B. Almost no current flows through a part of a circuit that has very low resistance
because it goes through the load.
OC. Almost all the current flows through a part of a parallel circuit with very low
resistance, instead of through the rest of the circuit.
O D. Having a part with very low resistance keeps circuit breakers and fuses from
opening the circuit
oc, it's the closest definition to a short circuit
Answer: almost all the current flows through a part of a parallel circuit, with very low resistance, instead of through the rest of the circuit.
Explanation:
why is a polarized filter helpful to a photographer? A. it transmits all light
Answer:
It blocks some light, but not all.
Explanation:
The point of polarization is to get the light to travel in a single plane. The light waves occur in a single plane. The direction of the vibration of the waves is the same. With two polarized filters, it is possible to block out nearly all the light.
True or False: For a given water velocity (distance traveled per unit time), the greater the cross sectional area of a stream channel, the lower will be the stream flow (discharge: volume of water per unit time).
For a given water velocity (distance traveled per unit time), the greater the cross-sectional area of a stream channel, the lower will be the stream flow (discharge: volume of water per unit time)" is a false statement.
What is Stream discharge?Stream discharge is measured by the volume of water flowing per unit of time, which is calculated by multiplying the stream's cross-sectional area (flow width × flow depth) by its water velocity. As a result, the given statement is false.
According to the formula, an increase in the cross-sectional area of the stream will cause a rise in the stream flow (discharge: volume of water per unit time) because it is multiplied by the velocity. So, for a given water velocity, the greater the cross-sectional area of a stream channel, the higher the stream flow (discharge: volume of water per unit time) will be.
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a 5 mm diameter, 50 mm long glass tube filled with water is rotated at 1000 rpm. what is the pressure at point a?
A 5 mm diameter, 50 mm long glass tube filled with water is rotated at 1000 rpm. The pressure at point A is 24.525 Pa.
The pressure at point A in a 5 mm diameter, 50 mm long glass tube filled with water when rotated at 1000 rpm can be calculated using the equation P = ρgr, where ρ is the density of the water, g is the acceleration due to gravity, and r is the radius of the tube.
Since the tube is 5 mm in diameter, the radius is 2.5 mm. The density of water is 1000 kg/m3 and the acceleration due to gravity is 9.81 m/s2. Therefore, the pressure at point A can be calculated as follows:
P = 1000 * 9.81 * 2.5 * 10-3 = 24.525 Pa
Therefore, the pressure at point A in a 5 mm diameter, 50 mm long glass tube filled with water when rotated at 1000 rpm is 24.525 Pa.
It is important to note that the pressure at point A will depend on the density of the fluid, the acceleration due to gravity, and the radius of the tube. As such, the pressure can be different for other fluids and for tubes with different radii.
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the us bank tower in los angeles is designed to resist an earthquake of what magnitude on the richter scale?
The 8.3 on the Richter scale earthquake magnitude can be withstood by the US Bank Tower in Los Angeles.
How earthquake-proof is the Los Angeles U.S. Bank Tower?A frame that is strengthened in two directions is part of the central core structure. Two struts, each one level high, are employed to decrease horizontal stresses brought on by wind or earthquakes beginning at the 53rd floor.
A 9.0 earthquake can a tower withstand?Indeed, it is the answer. Modern structural design techniques can be used to construct skyscrapers that can resist earthquakes. Performance-based structural design (PBSD), a cutting-edge design methodology for creating earthquake-resistant structures, is one of them.
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Without doing a calculation, predict which of these compounds has the greatest molar solubility in water . A) AgBr (Ksp = 5.0x10-13)
B) Agl (Ksp = 8.3x10-17)
C) AgCl (Ksp = 1.8x10-10)
Without doing a calculation, the compound that has the greatest molar solubility in water among the given compounds is AgCl.
The reason for this is because it has the largest Ksp value among the given options. Ksp, or the solubility product constant, is the equilibrium constant for the dissolution of a sparingly soluble compound in a solution. It represents the maximum amount of solute that may be dissolved in a solvent at equilibrium under given conditions.AgBr, AgI, and AgCl are all sparingly soluble in water.
They all have small solubility product constants, indicating that they dissolve very little in water at equilibrium. AgCl has the greatest molar solubility among the three options, according to the given Ksp values. Its solubility product constant is 1.8 x 10-10, which is much greater than those of AgBr and AgI. Therefore, AgCl is the compound with the greatest molar solubility in water without any calculation.In summary, among the given options, AgCl has the greatest molar solubility in water without any calculation.
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